Well in the sense that aiki is subtle, I think covert operations still seems like it could fit the bill. "Internal" seems to describe a covert op whereas "external" would seem to describe overt/conventional ops.

I see that as probably the way many would see it but I don't. For me there is no covertness and deception inherent in those principles described.

This is also where we part on the subject of Aiki. (assuming the second post is as part of aiki or aikido)